javascript - Isolate alpha value from background colour, convert from string to number, then validate -

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i'm looking check value of background colour on element, , if value rgba value want grab alpha channel , see if lower 1. return/exit if background colour isn't rgba value, i.e. if it's hex value, or rgb value.

i have feeling regex best approach this, after bit of head scratching i'm @ loss, , regex isn't strongest skill!

here's have already, , todo's things need little assistance with

  var hasopacity = false;   var backgroundcolor = $('.elemment-class').css('background-color');    // backgroundcolor return:   // (string / bool)   // - null             - ignore   // - transparent      - ignore   // - #000             - ignore   // - #ffffff          - ignore   // - rgb(0,0,0)       - ignore   // - rgba(0, 0, 0, 0.4)   //                  ^ need value if it's floating   // - rgba(0, 0, 0, 1)   //                 ^ or value if it's integer     function checkifbackgroundhasalpha(backgroundcolor) {      // @todo if background value of "ignore"s return because don't need      // continue if value rgba       // rgba lets process      if (isaplpa === true) {          // @todo first grab alpha section of rgba colour (regex perhaps?)         // i.e rgba(255, 255, 255, 0.4)         //                          ^         // or rgba(6, 39, 123, 1)         //                     ^          // @todo convert value string number          // run validation         if (alphanumber < 1) {            // know it's got opacity lets need plus            // set our var true later use            hasopacity = true;         }       }   }    // run check   checkifbackgroundhasalpha(backgroundcolor);    if (hasopacity) {      // yay we're here      console.log('yep have opacity on this');   }

thanks

you don't need regex @ all, in fact, can simplify approach down considerably given have specific set of input types.

function hasopacity(str) {     if (str) {         var tmp = str.split(',')[3];         if (tmp) {             var val = parsefloat(tmp);             return (!isnan(val) && val < 1);         }     }     return false; } hasopacity("rgba(0, 0, 0, 0.4)"); //true hasopacity("rgba(0,0,0,1)"); //false hasopacity(null); //false hasopacity("#ffffff"); //false

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